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Algae Discoloration -- A dark roof discoloration caused by an airborne fungus "gleo capsa."
APP --Atactic Polypropylene, a type of torchdown.
Architectural Shingles -- See Laminated Shingles
Asphalt -- A bituminous waterproofing agent applied to roofing materials during manufacture. See composition and underlayment.
Asphalt Cement -- An asphalt based cement used to bond roofing materials.
Asphalt Shingles -- Roofing material that consists of a base material which is coated with asphalt and granulated minerals. Another term used for composition shingles.
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Back Pan -- See Pan
Bargeboard -- A board, often carved, hanging from the projecting or rake end of a sloping roof.
Base Flashing -- That portion of the flashing attached to or resting on the deck to direct the flow of water onto the roof covering. See Cap Flashing.
Base Material -- Mat used as a base for asphalt coated roofing material. Most underlayments are organic mat. Most shingles are fiberglass mat.
Bird Blocks -- Holes cut at soffit for attic ventilation. See Soffit Vent.
Bituminous -- Of bitumen. Bitumen is a mixture of hydrocarbons found in asphalt and tar or distilled from petroleum or oil.
Blow Back -- Wind driven rain that blows up the roof far enough to leak by going over the top of the unexposed roofing material. This mostly occurs on improperly installed low slope roofs. See Low Slope Application.
Built-up Roof (BUR) -- A flat or low-slope roof consisting of multiple layers of asphalt and ply sheets (unsaturated felt). Often referred to as Hot Tar or Tar and Gravel.
Bundle -- A package of shingles, shakes, ridge or starter.
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Cap Flashing -- That portion of the flashing attached to a vertical surface to prevent water from migrating behind the base flashing. Sometimes called counter flashing or mortar flashing on masonry.
Cathedral Ceiling -- Area of interior which has high sloped ceilings that usually follow the roof line. These areas are best ventilated with a ridge vent.
Caulk -- Asphalt cement or silicone sealer used to fill a joint to prevent leaks.
Class "A" -- The highest rating of fire resistance for roofing as per the Underwriters Laboratories. Indicates roofing is able to withstand severe exposure to fire Originating from sources outside the building. Class B and C have moderate and light resistance to fire respectively.
Clear Story -- The uppermost area of a roof plane that drops off without intersecting with another roof plane.
Clear Store Flashing -- Flashing which covers the clear story area of the roof much like ridge cap covers the ridge.
Closed Cut Valley -- A method of valley treatment in which asphalt shingles from one side of the valley extend across the valley while asphalt shingles from the other side are trimmed back from the valley centerline. Also known as a lap cut valley.
Composition -- Roofing material that consists of a base material which is coated with asphalt and granulated minerals. Another term used for asphalt shingles.
Counter Flashing -- See Cap Flashing. Term commonly misused for base flashing.
Course -- A row of roofing material (shakes, shingles), running horizontal (perpendicular to the drip line).
Cricket -- A pitched construction at the back of a chimney or other vertical surface to deflect water around said vertical surface.
Collar -- See Plumbing Vent Jack.
Cutout -- The open portions of a 3-tab strip shingle between the tabs. Also called the keyway.
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